Read Sharp ER-A490 (serv.man4) Service Manual online
4) Pin description
No.
Pin No.
Pin name
I/O
ER-A5RS
Data bus
1
1
DB4
I/O
DB4
2
2
DB5
I/O
DB5
3
3
DB6
I/O
DB6
4
4
DB7
I/O
DB7
5
41
DB0
I/O
DB0
6
42
DB1
I/O
DB1
7
44
DB2
I/O
DB2
8
45
DB3
I/O
DB3
9
46
RCVDT1
I
RCVDT1
RS-232 reception data signal
10
13
RCVDT2
I
RCVDT2
11
47
GND
–
GND
12
5
TRNCLK1-
I
GND
Data transmission clock
13
15
TRNCLK2-
I
GND
14
6
W-
I
W-
Write signal
15
7
CS1-
I
CS1-
RS-232 chip select
16
12
CS2-
I
CS2-
17
8
RSLCT0
I
AB0
Address bus
18
11
RSLCT1
I
AB1
19
9
R-
I
R-
Read signal
20
10
RCVRDY1
O
RCVRDY1
RS-232 data reception enable signal
21
16
RCVRDY2
O
RCVRDY2
22
28
TRNRDY1
O
TRNRDY1
RS-232 data transmission enable signal
23
17
TRNRDY2
O
TRNRDY2
24
29
BRK1
O
BRK1
Break code detection signal
25
18
BRK2
O
BRK2
26
30
CTS1-
I
(CTS1-)GND
RS-232 clear to send signal
27
20
CTS2-
I
(CTS2-)GND
28
31
TRNEMP1
O
TRNEMP1
RS-232 transmission buffer empty signal
29
21
TRNEMP2
O
TRNEMP2
30
14
NC
–
NC
31
24
NC
–
NC
32
38
NC
–
NC
33
48
NC
–
NC
34
19
OPEN
NC
35
43
OPEN
NC
36
32
TRNDT1
O
TRNDT1
RS-232 transmission data signal
37
22
TRNDT2
O
TRNDT2
38
35
DSR1-
I
DSR1-
RS-232 data set ready signal
39
23
DSR2-
I
DSR2-
40
36
RTS1-
O
NC
Request to send signal
41
25
RTS2-
O
NC
42
37
DTR1-
O
DTR1-
RS-232 data terminal ready signal
43
26
DTR2-
O
DTR1-
44
39
RCVCLK1-
I
GND
Data reception clock
45
27
RCVCLK2-
I
GND
46
33
CLOCK
I
CLOCK
Clock signal
47
34
RST
I
RES
RESET signal
48
40
VCC
–
+5V
+5V
3 – 6
Click on the first or last page to see other ER-A490 (serv.man4) service manuals if exist.